If you don't believe in psychics or aren't spiritual, this question isn't for you?

I don't believe in every psychic but I do believe in the one I go to because I've been going for years and everything she has said so far has been true. On my last visit she told me that in April my third eye will open and remain open for the next 3 years in which I will learn and grow. My question is what is the third eye and what does she mean by it being open for the next three years?